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This study investigates the spin susceptibility in U-based superconductorUTe$_2$ in the superconducting (SC) state by using Knight shift measurementsfor a magnetic field $H$ along the $a$ axis, which is the magnetic easy axis ofUTe$_2$. Although a tiny anomaly ascribed to the SC diamagnetic effect wasobserved just below the SC transition temperature $T_{\rm c}$, the $a$-axisKnight shift in the SC state shows no significant decrease, following theextrapolation from the normal-state temperature dependence. This indicates thatthe spin susceptibility is nearly unchanged below $T_{\rm c}$. Considering theprevious Knight shift results for $H \parallel b$ and $H \parallel c$, thedominant SC state is determined to be $B_{\rm 3u}$ in the spin-triplet pairing,which is consistent with the spin anisotropy in the normal state. The presentresult shows that UTe$_2$ is a spin-triplet superconductor with spin degrees offreedom.

Superconducting order parameter in UTe$_2$ determined by Knight shift measurement